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Mechanical Properties of Neutron Irradiated Fe-Cr and Fe-Mn Alloys

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The mechanical property change due to the evolution of defect structures by the irradiation of neutrons was investigated on several Fe-Cr and Fe-Mn alloys irradiated in the JMTR and FFTF. With increase in manganese levels, dislocation loop density increases much larger than for chromium levels in irradiation in the JMTR, while in the FFTF, dislocation density of the Fe-Cr alloys is much larger than in the Fe-Mn alloys. This reverse trend is brought about by the saturation in the development of dislocation loops. The Fe-0.1 and 0.4%Cr whose dislocation density is much lower than that of the Fe-2%Mn showed the increment in yield strength almost the same as that of the Fe-2%Cr and rather larger than that of the Fe-2%Mn, respectively, in the JMTR. Yield strength increase without significant variation in the strain hardening exponent is observed for the Fe-0.1%Cr and Fe-0.1%Mn irradiated in the FFTF and very small voids are observed in the Fe-0.1%Mn irradiated in the JMTR. These results suggest the existence of invisible defect clusters produced by irradiation.

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